基于机载LiDAR技术的地面沉陷变形DEM构建方法探究  

DEM construction method of land surface subsidence and deformation based on airborne LiDAR technology

作　　者：蔡巧云 沈建华 CAI Qiaoyun;SHEN Jianhua(Hangzhou Tongji Surveying and Mapping Co.,Ltd.,Hangzhou,Zhejiang 311100,China)

机构地区：[1]杭州同济测绘有限公司,浙江杭州311100

出　　处：《测绘技术装备》2024年第2期23-27,共5页Geomatics Technology and Equipment

摘　　要：针对矿区大范围地面沉陷变形难以监测的问题,本文采用机载激光雷达(LiDAR)技术对矿区进行地面沉陷变形监测。结果表明,采用改进的渐进加密三角网滤波算法和局部多项式插值法对机载LiDAR点云数据进行处理,可获得精度较高的沉陷变形数字高程模型(DEM),且通过点云降噪、滤波和插值,可将沉陷变形监测误差控制在50 mm以内。机载LiDAR技术不仅弥补了传统摄影测量参数计算复杂,外业工作量大,监测效率低等缺陷,还能不受地形和地貌等外界环境因素影响,对大范围地面沉陷变形进行监测。因此,该项技术对于监测矿区地面沉陷变形,合理设计矿区开采工作面,保护沉陷区地表建筑物具有重要的意义。Airborne light detection and ranging(LiDAR)technology is used in this paper to solve the problem that it is difficult to monitor the large-scale land surface subsidence and deformation in mining area.The results show that the improved progressive densified triangulation filtering algorithm and local polynomial interpolation method are used to process the airborne LiDAR point cloud data,and a high-precision subsidence and deformation digital elevation model(DEM)can be obtained,and the monitored subsidence and deformation error can be controlled within 50 mm by point cloud noise reduction,filtering and interpolation.Airborne LiDAR technology can be used to monitor large-scale land surface subsidence and deformation due to the reasons that it not only overcomes the shortcomings of traditional photographic surveying,but also can not be affected by external environmental factors such as topography and landform.Therefore,the technology is of great significance for subsidence and deformation monitoring in the mining area,reasonably designing the mining face and protecting the surface buildings in the subsidence area.

关 键 词：地面沉陷变形监测 机载激光雷达 滤波算法 插值法 数字高程模型 

分 类 号：P231[天文地球—摄影测量与遥感]